Where was the first successful mumps vaccine developed?

The first successful mumps vaccine was developed by Maurice Hilleman at Merck’s research facilities in West Point, Pennsylvania. Hilleman isolated the virus from his daughter Jeryl Lynn in 1963, and the vaccine strain was named after her. The vaccine was licensed in 1967 and later became part of the combined MMR vaccine. Mumps once caused widespread outbreaks and complications such as meningitis and hearing loss. Vaccination greatly reduced cases in countries that adopted it widely.